Rapitest Digital Soil PH Meter

Plants need the correct pH level which controls how well plants utilize
the nutrients available in your soil. All plants have a pH preference,
so it is important to know the pH level of your soil. You can choose
plants with the same pH preferences, avoid those that will not do well
in your soil, or know how to go about supplying their special growing
needs. By testing your soil, you determine it condition so that you can
adjust pH more accurately, effectively and economically.